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COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; FeNO, fractional exhaled nitric oxide; LAA, low attenuation area; HRCT, high-resolution computed tomography; DLco, diffusing capacity of the lung for carbon monoxide; VA, alveolar volume; ACO, asthma-chronic obstructive pulmonary disease overlap.
